The Castillo de San Marcos (Spanish for “St. Mark’s Castle”) is the oldest masonry fort in the continental United States; it is located on the western shore of Matanzas Bay in St. Augustine, Florida.
It was designed by the Spanish engineer Ignacio Daza, with construction beginning in 1672, 107 years after the city's founding by Spanish Admiral and conquistador Pedro Menéndez de Avilés, when Florida was part of the Spanish Empire. The fort's construction was ordered by Governor Francisco de la Guerra y de la Vega after a raid by the English privateer Robert Searles in 1668 that destroyed much of St. Augustine and damaged the existing wooden fort. Work proceeded under the administration of Guerra's successor, Manuel de Cendoya in 1671, and the first coquina stones were laid in 1672. The construction of the core of the current fortress was completed in 1695, although it would undergo many alterations and renovations over the centuries.
When Britain gained control of Florida in 1763 pursuant to the Treaty of Paris, St. Augustine became the capital of British East Florida, and the fort was renamed Fort St. Mark until the Peace of Paris (1783) when Florida was transferred back to Spain and the fort's original name restored. In 1819, Spain signed the Adams–Onís Treaty which ceded Florida to the United States in 1821; consequently, the fort was designated a United States Army base and renamed Fort Marion, in honor of American Revolutionary War hero Francis Marion. The fort was declared a National Monument in 1924, and after 251 years of continuous military possession, was deactivated in 1933. The site was subsequently turned over to the United States National Park Service. In 1942 the original name, Castillo de San Marcos, was restored by an Act of Congress.
Castillo de San Marcos was attacked several times and twice besieged: first by English colonial forces led by Carolina Colony Governor James Moore in 1702, and then by English Georgia colonial Governor James Oglethorpe in 1740. However, possession of the fort has changed five times, all peaceful, among four different governments: Spain, 1695–1763 and 1783–1821, Kingdom of Great Britain, 1763–1783, and the United States, 1821–date (during 1861–1865, under control of the Confederate States of America). Owing to its strategic cannon placement and star-shaped design, the fort was never breached or taken by force throughout its various stages of sovereign ownership.
Under United States control the fort was used as a military prison to incarcerate members of Native American tribes starting with the Seminole—including the famous war chief, Osceola, in the Second Seminole War—and members of western tribes, including Geronimo's band of Chiricahua Apache. The Native American art form known as Ledger Art had its origins at the fort during the imprisonment of members of the Plains tribes such as Howling Wolf of the southern Cheyenne.
Although built in part by African slaves owned by the Spanish, the fort later served as one of the first entry points of fugitive slaves from British North America into Spanish Florida, where they were freed by the Spanish colonial authorities. This quickly led to the first free Black settlement in the future United States (Fort Mose, formed just north of St Augustine).
Ownership of the Castillo was transferred to the National Park Service in 1933, and, along with the nearby St. Augustine Historic District, has been a popular tourist destination ever since.
Structure
The European city of St. Augustine was founded by the admiral Pedro Menéndez de Avilés for the Spanish Crown in 1565 on the site of a former Native American village called Seloy.
The need for fortifications was recognized after it was attacked by Sir Francis Drake and his fleet of 22 ships in 1586, and over the next 80 years, a succession of nine wooden forts were built in various locations along the coastline. After an attack in 1668 by the English pirate Robert Searle, however, during which the town of St. Augustine was burned to the ground, wooden forts were deemed inadequate, and Mariana, Queen Regent of Spain, approved the construction of a masonry fortification to protect the city.
The Castillo is a masonry star fort made of a stone called coquina (Spanish for "small shells"), which consists of ancient shells that have bonded together to form a sedimentary rock similar to limestone. Native Americans from Spain's nearby missions did most of the labor, with additional skilled workers brought in from Havana, Cuba. The coquina was quarried from the 'King's Quarry' on Anastasia Island in what is today Anastasia State Park across Matanzas Bay from the Castillo, and ferried across to the construction site. Construction began on and lasted twenty-three years, with completion in 1695.
The fort has four bastions named San Pedro, San Agustín, San Carlos, and San Pablo, with a ravelin protecting the sally port. On the two landward sides, a large glacis was constructed which would force any attackers to advance upward toward the fort's cannon and allow the cannon shot to proceed downslope for greater efficiency in hitting multiple targets. Also, the artificial mound of the glacis in front of the walls helped to protect them from direct cannon fire attempting to breach them in a siege. Immediately surrounding the fort was a moat which was usually kept dry, but that could be flooded with seawater to a depth of about in case of attack by land.
Multiple embrasures were built into the curtain wall along the top of the fort as well as into the bastions for the deployment of a cannon of various calibers. Infantry embrasures were also built into the walls below the level of the terreplein for the deployment of muskets by the fort's defenders. It was through one of these embrasures that twenty Seminoles held as prisoners would escape in 1837.
History
First English siege
In 1670, Charles Town (modern-day Charleston, South Carolina) was founded by English colonists. As it was just two days' sail from St. Augustine, the English settlement and encroachment of English traders into Spanish territory spurred the Spanish in their construction of a fort.Arnade, Charles W (1962). "The English Invasion of Spanish Florida, 1700–1706". The Florida Historical Quarterly (Florida Historical Society) (Volume 41 Number 1, July 1962): p. 31.
Slaves from the Carolina colony began escaping to St Augustine in 1687, where the Spanish agreed to free (and employ) them if they converted to Catholicism. When an English major from Carolina attempted to retrieve escapees in 1688, the Spanish Governor Diego de Quiroga refused. Charles II of Spain issued an official policy in 1693, cementing the informal practice.
In 1702, English colonial forces under the command of Carolina Governor James Moore Sr. embarked on an expedition to capture St. Augustine early in Queen Anne's War.Arnade, Charles (1959). The Siege of Saint Augustine 1702. University of Florida Monographs: Social Sciences #3. Gainesville, FL: University of Florida Press. . pp. 5, 14. The English laid siege to St. Augustine in November 1702.Arnade (1959), p. 37. About 1,500 town residents and soldiers were crammed into the fort during the two-month siege. The small English cannons had little effect on the walls of the fort, because the coquina masonry was very effective at absorbing the impact of cannonballs causing them to sink into the walls, rather than shattering or puncturing them.Bushnell, Amy Turner (1994). The Archaeology of Mission Santa Catalina de Guale, Volume 3. New York: University of Georgia Press. . . p. 192
The siege was broken when the Spanish fleet from Havana arrived, trapping some English vessels in the bay.Arnade (1959), pp. 55–57. The English decided to burn their ships to prevent them from falling under Spanish control, and then marched overland back to Carolina.Arnade (1962), p. 33. The town of St. Augustine was destroyed, in part by the Spanish and in part by the English, as a result of the siege.Arnade (1959), pp. 41–43, 47, 56.
Second period of construction
Beginning in 1738, under the supervision of Spanish engineer Pedro Ruiz de Olano, the interior of the fort was redesigned and rebuilt. Interior rooms were made deeper, and vaulted ceilings replaced the original wooden ones. The vaulted ceilings allowed for better protection from bombardments and allowed for cannon to be placed along the gun deck, not just at the corner bastions. The new ceilings required the height of the exterior wall to be increased from 26 to .
Second British siege
Spain and Britain were rivals in Europe, and since the two countries had both founded empires in the New World, their rivalry continued there as well. In 1733, the British merchantmen Rebecca, commanded by Captain Robert Jenkins, was seized in the Caribbean by the Spanish coast guard. Suspecting that Rebecca had been trading illegally with Spanish colonies (which was forbidden by both Spain and Britain), the Spanish searched the ship. A fight broke out between the Spanish and British sailors. In the skirmish, Jenkins had his ear cut off by a Spanish officer, who picked it up and said "Take this to your king and tell him that if he were here I would serve him in the same manner!" When Jenkins reported the incident to British authorities, they used it as a casus belli to declare war on Spain in 1739. The war was called the War of Jenkins' Ear.
After British Admiral Edward Vernon won a significant victory at Portobelo, General James Oglethorpe, the founder of Georgia, was quick to imitate him in North America. In June 1740, Oglethorpe and a British fleet of seven ships appeared off St. Augustine. As in the 1702 siege, three hundred soldiers and 1,300 residents found refuge within the Castillo's walls. For 27 days the British bombarded the Castillo and St. Augustine. Realizing his cannon were not affecting the Castillo's walls of coquina, Oglethorpe decided to starve the people of St. Augustine into submission by blockading the inlet at the Matanzas River and all roads into St. Augustine. However, some supplies were able to reach the city via the river, and with morale and supplies low for the British forces, Oglethorpe had to retreat. In order to protect the city from future blockades and sieges, the Spanish built Fort Matanzas to guard the river, which could be used as a rear entrance to avoid St. Augustine's primary defense system.
British occupation
In 1763, the British managed to take control of the Castillo but not by force. As a provision of the Treaty of Paris (1763) after the Seven Years' War, Britain gained all of Spanish Florida in exchange for returning Havana and Manila to Spain. On July 21, 1763, the Spanish governor turned the Castillo over to the British, who established St. Augustine as the capital of the province of East Florida, established by the Royal Proclamation of 1763.
The British made some changes to the fort, and renamed it Fort St. Mark. As Great Britain was the dominant power in North America, they were not worried about keeping the fort in top condition. This attitude prevailed until the outbreak of the American Revolutionary War. The fort was used as a military prison during the war. Among those imprisoned was Christopher Gadsden, the Lieutenant governor of South Carolina. He was also a delegate to the Continental Congress and a brigadier general in the Continental Army during the war. He was released after 11 months.Daniel J. McDonough (2000). Christopher Gadsden and Henry Laurens: The Parallel Lives of Two American Patriots p. 241. Susquehanna Univ Pr.